An instrument is described in which the momentum of single cosmic-ray particles is measured, the particles leaving the instrument in a sufficiently collimated beam for use in subsequent experiments. The 'maximum detectable momentum' of the apparatus is about 3 X 10' ' ev/C., almost all particles are collected within IO" of the zenith and in directions individually defined to i lo, the output is about 400 particles/day, and the proportion of spurious records is of the order of, or less than, 0.1%.
J ( l r H h /LHdV>PROC. PHYS. SOC. LXIII, IO-A
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.